My cousin's name is Maclean and we call him Mac. I also have a neighbor named Macarthur that's Mac for short.

I always think of "Macaulay" as in Macaulay Caulkin. But there *are* other "Mac" names out there. And, I suppose, it could just be Mac.

How about Mac.... intosh. Har har. Then an iPod commercial with him could be "iMac". Which is already a real thing!

I know a few Macs. I think it's getting popular. (Due to Foster's, no doubt! ;) )

I know a dog named Mac...

Me too :P Short for anything?

I don't think so.

EDIT: Actually, now I think it was short for something. But I forgot what it was. But this dog was a cartoon character...

http://www.babynames.com/Names/name_display.php?n=Mac

"Mac" is a name registered on babynames.com. Unlike the names "Goo" and "Frankie."

alot of people call me mac cus my last name (Mckown). i like it cus it only has three letters (im so lazy). i try to use my birth name online so people dont get confused with mac from fosters.

Goo is more then likely something she prefers to call herself for one of 3 reasons:

1. It's a shorter or "funnier" version of her real name.
2. It's a nickname for something she did or happened to her in her life.
3. She's insane.

And I'm more inclined to go with 3 8D, don't take it personal "Goo fans", we all know she's a few chocolate chips short of a cookie. Frankie is obviously used because Francis sounds too formal, too stuffy, and downright too weird.

Ever see the show Angel? There's a girl in there named Fred which is short for Winifred. Mac though I don't know what that could be short for or unless it's a name in and of itself. I had a teacher once known as Mr. Mac in junior high.

Mac was short for "Macomber" which was his last name, he died sadly years ago. Anyway that's what I think in regards to Mac, Goo, and Frankie's namesakes.